Investigation on a substructure-TVMD (SSTVMD) system for seismic response control of civil structures

• Published in: Structures (Oxford) 2024-11, Vol.69, p.107517, Article 107517
• Main Authors: He, Hui, Hao, Linfei, Zhong, Jiacheng, Zhou, Yun, Lin, Zicong, Xiang, Yue
• Format: Article
• Language: English
• Subjects: Control efficiency; Control mode; Parameter optimization; Substructure; Tuned viscous mass damper
• ISSN: 2352-0124; 2352-0124
• DOI: 10.1016/j.istruc.2024.107517

Applications of inerter-based dampers (IBDs) to connect existing primary structures with additional substructures provide an external solution for response control of the primary structures. This solution avoids affecting the internal space and functionality of the primary structures, while the energy dissipation enhancement and inertance amplification properties of IBDs are beneficial for effectively controlling the primary structures by locally attaching the substructures. In this study, given that the tuned viscous mass damper (TVMD) is widely recognized as one of the effective IBDs for seismic response control of civil structures, the substructure-TVMD (SSTVMD) is proposed to strengthen the primary structures. The additional equivalent damping ratio (EDR) is utilized as an index for evaluating the control effectiveness of SSTVMD. The theoretical expression for EDR is derived based on the assumption of white noise excitation. By maximizing the EDR, two groups of closed-form solutions for the optimum design parameters of SSTVMD are obtained, representing two distinct control modes, respectively. The parametric analysis results demonstrate that the control effectiveness of SSTVMD is primarily influenced by the TVMD mass ratio and the damping ratio of the primary structure. The results of response spectrum analysis and energy response analysis demonstrate the disparity between the two control modes, while also confirming the advantage of the high control efficiency offered by the optimized SSTVMD. Owing to the energy dissipation enhancement and tuning effects, the two control modes of SSTVMD (namely SSTVMD1 and SSTVMD2, respectively) both exhibit remarkably better control effectiveness over the substructure-viscous-damper (SSVD) system. Furthermore, SSTVMD1 is a more favorable option compared to SSTVMD2 due to its superior control efficiency and energy dissipation efficiency.